@extra-iterable/scan-while-right

Scans from right, while a test passes. :package: :smiley_cat: :running: :vhs: :moon: :scroll: :newspaper: :blue_book:

Usage no npm install needed!

<script type="module">
  import extraIterableScanWhileRight from 'https://cdn.skypack.dev/@extra-iterable/scan-while-right';
</script>

README

Scans from right, while a test passes. :package: :smiley_cat: :running: :vhs: :moon: :scroll: :newspaper: :blue_book:

Alternatives: scanWhile, scanWhileRight, scanUntil, scanUntilRight.
Similar: search, scan, find.

This is part of package extra-iterable.


iterable.scanWhileRight(x, ft);
// x:  an iterable
// ft: test function (v, i, x)
// → first index where test passes till end

const iterable = require("extra-iterable");

var x = [1, 1, 2, 2, 3, 3, 4, 4];
iterable.scanWhileRight(x, v => v % 3 !== 0);
// 6                       ^

iterable.scanWhileRight(x, v => v % 2 !== 0);
// 8                            ^

iterable.scanWhileRight(x, v => v % 6 !== 0);
// 0    ^


References